14 12 Roof Slope Factor

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

14 12 roof slope factor.

For example suppose you have a 4 12 pitch roof and the width of the house is 28 feet. Divide the rise by the run the run is 12. The table below shows common roof pitches and the equivalent grade degrees and radians for each. For example if you measure 4 inches the pitch of your roof is 4 12.

This will give you the rise over run or pitch. A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof for roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. For any roof slope expressed as x in 12 rise in run the hip and valley factor is determined by finding the square root of rise run 2.

Dividing the house width by two equals 14 feet. The length of the roof is 14 feet and three quarters of a foot or 14 feet 9 inches. Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used. The combination of two numbers are used to display or show the roof pitch.

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. Looking at the chart the factor is 1 0541. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Multiply 14 by 1 0541 resulting in 14 75 feet.

Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter. Outside of the u s a degree angle is typically used. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials. The roof slope factor chart also consists of conversion factors to determine the slope of the roof.

Divide the rise by the run the run is 12. Most roof s have a pitch in the 4 12 to 9 12 range. Find the square root of the. Roof pitch 6 12 roof length including overhangs 40 gable wall length including overhangs 24 enter 6 into the calculator slope factor 1 1180 multiply the roof length by the gable wall length 40 24 960 multiply this amount by the slope factor 960 1 1180 1073 28 the area of this roof 1073 3 sq.

The hip and valley factor varies according to the slope of the roof as shown in the table below.